Here's a sequence of photos that show the mast array on my OSCAR II in action. I put so much focus on getting the mechanics to work I've not yet gone back to finish off detailing the actual mast array. (And one of the antennas is missing the upper part.) It's really neat to see the whole thing work though. Just to keep a perspective on how small this mechanism is the opening for the smallest set of doors is roughly 1/4" x 1/4".
Doors closed, masts down. I noticed in photos of the full sized sub that they don't have doors for the small diameter masts, just the larger square ones, so that's how I built mine too. I also wanted to be somewhat selective about what masts I brought up as you don't generally see all
the antennas up at once, but I still "faked out" the doors that I wasn't going to use to give the sail a more uniform look when everything was retracted.
Doors about half way open.
Doors now nearly completely open, masts starting to come up. You can't really tell from the photo, but the mast array has raised about 0.1" from it's bottom most position.
Doors fully open, masts about raised about 1".
Doors open, masts raised. The total travel on the mast array is about 3".
This mechanism operates freely enough that it's all driven from a single HS85 servo. The doors are driven with a magnetically coupled cam on the first 0.150" of travel of the mast array, which is coupled to the servo using bellcranks and levers.